EP2007539A1 - Verfahren zum einbringen eines tieflochs und pilotbohrer hierfür - Google Patents
Verfahren zum einbringen eines tieflochs und pilotbohrer hierfürInfo
- Publication number
- EP2007539A1 EP2007539A1 EP07703917A EP07703917A EP2007539A1 EP 2007539 A1 EP2007539 A1 EP 2007539A1 EP 07703917 A EP07703917 A EP 07703917A EP 07703917 A EP07703917 A EP 07703917A EP 2007539 A1 EP2007539 A1 EP 2007539A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- drill
- pilot drill
- deep hole
- diameter
- pilot
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B41/00—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor
- B23B41/02—Boring or drilling machines or devices specially adapted for particular work; Accessories specially adapted therefor for boring deep holes; Trepanning, e.g. of gun or rifle barrels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B51/00—Tools for drilling machines
- B23B51/02—Twist drills
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/04—Angles, e.g. cutting angles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/14—Configuration of the cutting part, i.e. the main cutting edges
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23B—TURNING; BORING
- B23B2251/00—Details of tools for drilling machines
- B23B2251/18—Configuration of the drill point
Definitions
- the present invention relates to a method for introducing a deep hole and a pilot drill for this purpose.
- the actual deep hole drill is then positioned exactly on the recess so that the blind bore introduced with the aid of the pilot drill centers and / or pilots the following deep hole drill.
- a blind hole is inserted into the material to be processed with the aid of the pilot drill.
- the pilot drill has a slightly larger drilling diameter than the following deep hole drill. Otherwise, the deep hole drill would be extremely stressed when penetrating into the blind hole at the frontal corners of the main cutting edge, resulting in increased wear of the deep hole drill.
- Typical deep hole drills have a point angle of about 130-140 ° and a relatively thick core area of about 25-40% of the diameter of the drill. Recent test results have shown that a point angle of about 140 ° gives the best results. In the area of the core area, the apex angle is flatter, usually lying at 160 °.
- the geometry of the deep hole drill is optimized for the actual drilling process of the deep hole. Particular emphasis is placed on optimum chip formation and chip removal.
- the pilot drill As a pilot drill usually a drill is used with substantially the same tip geometry as the deep hole drill, the pilot drill has a slightly larger diameter drill and of course much shorter and thus stiffer, so that with the pilot drill in a simple manner, a corresponding centering or piloting recess can be introduced into the material to be processed. Essentially, the situation shown in FIG. 1 then arises. Shown is the deep hole drill 1, which is just in the of the pilot drill (not shown) inserted into the machined material 15 blind bore 2.
- the blind bore 2 has a diameter which is slightly larger than the diameter of the deep hole drill 1, as can be clearly seen in Figure 1.
- the contour of the blind hole 2 is essentially the tip geometry of the pilot drill again.
- the tip angle ⁇ is typically about 140 °.
- a core area 3, which makes up about 25-40% of the drill diameter or blind hole diameter, has a flatter point angle ⁇ of about 160 °.
- the deep hole drill 1 has essentially the same tip geometry.
- the bottom of the blind hole 2 thus has a substantially conical shape, wherein the cone tip in the core region 3 is slightly flattened. It can be clearly seen that in cross-section, the conical shape of the blind hole 2 runs almost parallel to the main cutting edge 4 of the deep hole drill.
- This object is achieved in that initially with the aid of a pilot drill with a shank and a head portion, wherein the head portion has on one end face a conical main cutting edge and two helically extending on the outside of the head portion flutes, a rotationally symmetrical recess is introduced into the material to be processed , And then using a deep hole drill, the deep hole to be introduced is drilled in the base of the rotationally symmetrical recess, wherein the pilot drill has a point angle which is greater than the tip angle of the down hole drill.
- the rotationally symmetrical recess or introduced for centering or piloting blind hole is performed with a drilling ground, which is shallower than the tip of the deep hole drill.
- the tip angle of the pilot drill is at least 3 °, preferably between 5 ° and 20 ° and more preferably between 8 ° and 12 ° greater than the tip angle of the deep hole drill.
- the core thickness of the head portion of the pilot drill is smaller than the core thickness of the head portion of the deep hole drill.
- the core thickness of the head portion of the pilot drill bit is less than 25%, preferably less than 22%, and more preferably between 18 and 22% of the diameter of the pilot drill at the face of its head portion. Tests have shown that such a core thickness achieves the best results. In principle, the core thickness should be as small as possible in order to achieve particularly good centering properties. If, however, the core thickness is chosen too low, this leads to a weakening of the pilot drill, which in the worst case can lead to a drill breakage. - -
- the pilot drill Since it essentially depends on the smallest possible diameter of the drill core only in the forehead, it is provided in a further embodiment of the invention that the pilot drill has a core with increasing in the direction of the shaft diameter. As a result, the core diameter at the drill tip can be further reduced without causing any significant weakening of the pilot drill.
- the drill bit of the pilot drill has in the region of the front end of the spiral grooves Ausspitzept which are formed such that at the front side a small core area of less than 20%, preferably less than 15% and particularly preferably about 5 -10% of the diameter of the pilot drill is formed.
- This measure also means that the rotationally symmetrical recess, which is generated by the pilot drill, flattens only in a very small area in the center of the recess.
- the present invention seeks to maintain the tip angle of the pilot drill over a large area that extends as far as possible into the center. Only in the small core area is a core tip angle measured, which is greater than the tip angle of the main cutting edges.
- the invention provides that the diameter of the pilot drill is larger than the diameter of the deep hole drill. Although there must be sufficient clearance (clearance) between the pilot hole and the deep hole drill, so that the deep hole drill is not extremely stressed when penetrating into the blind hole at the frontal corners of the main cutting, resulting in increased wear of the down hole drill. On the other hand, the clearance must not be so great that the leadership of the deep hole drill is affected.
- pilot drills and deep hole drills have the same nominal diameter, but are designed as a clearance system according to DIN ISO 286.
- the pilot drill is produced with the tolerance p7. If the tolerance of the deep hole drill is different, the tolerance of the pilot drill should be chosen so that it gives the same clearance.
- the particularly preferred size of the game thus results from the following table:
- the left column shows different nominal diameter ranges.
- the second and third columns describe the tolerances of tolerance class h7 as a function of the different diameter ranges. So if a deep hole drill with a nominal diameter of 5 mm with - -
- the head portion of the pilot drill is slightly tapered in such a way that decreases in the region of the flutes of the diameter of the drill from the front side in the direction of the shaft.
- the pilot drill has the largest diameter at its end. The reason for this is to reduce the contact area of the minor cutting edge of the pilot drill on the walls of the bore. A regrinding of the pilot drill automatically leads to a shortening of the drill and thus also to a diameter reduction. This in turn leads to a reduction of the game.
- the head portion is conical, so that he rejuvenated in the direction of the shaft portion by less than 3 microns, more preferably between 1 and 2 microns per millimeter groove length.
- the interaction between pilot drill on the one hand and subsequent deep hole drill on the other hand is important. Basically, it would therefore be possible to maintain conventional pilot drill and change the tip geometry of the deep hole drill accordingly. However, since the tip geometry of the deep hole drill is designed so that very deep holes can be made quickly and with the least possible wear on the drilling tool, it is provided according to the invention to modify the pilot drill accordingly.
- a pilot drill with a shank and a head portion wherein the head portion has on its end face a conical main cutting edge and two spirals running spirally on the outside of the head section, is provided, in which the point angle of the main cutting edge is greater than 145 °.
- the point angle of the main cutting edge is between 148 and 155 °, and more preferably the point angle is about 150 °.
- the choice of this tip angle for the pilot drill is of great advantage.
- the core thickness of the head portion is less than 25%, preferably less than 22%, and more preferably between 18 and 22% of the diameter of the pilot drill at the end face of its head portion.
- the drill core of the drill head has a diameter which increases in the direction of the shaft.
- the drill head has in the region of the front end of the spiral grooves Ausspitzungen, which are designed such that at the front side a small core area of less than 20%, preferably less than 15% and particularly preferably about 5 to 10% of the diameter of the pilot drill is formed.
- the length of the flutes in the axial direction is less than six times the drill diameter, preferably smaller than five times the drill diameter and more preferably approximately equal to 4.5 times the drill diameter.
- the pilot drill is designed as a chamfer drill.
- the chamfer of the deep hole can then already be produced with the help of the pilot drill.
- An additional step merely for producing the chamfering is not necessary.
- Figure 1 is a schematic representation of the engagement conditions according to a method of
- Figure 2 is a schematic representation of the engagement conditions according to the inventive method
- Figure 3 is a plan view of the tip of an embodiment of the pilot drill according to the invention
- FIG. 4 is a fragmentary perspective side view of the pilot drill of FIG. 3;
- Figure 1 shows schematically the engagement conditions when introducing a deep hole drill in a previously introduced by a pilot drill blind bore, as they are in the prior art.
- the ratios shown in FIG. 2 are present.
- FIG. 1 the situation is shown schematically shortly before the deep hole drill 1 dips into the blind bore 2 previously introduced by the pilot drill (not shown).
- the deep hole drill 1 shown in FIG. 2 corresponds to the deep hole drill shown in FIG. Figure 2 differs from Figure 1 in that the geometry of the blind hole and therefore the geometry of the pilot drill used was selected according to the invention. It can be clearly seen that the conical bore bottom 17 of the blind hole 2 now extends substantially flatter than the tip angle of the main cutting edge 4 of the deep hole drill 1.
- the deep hole drill 1 is moved in the direction of arrow 18 in the direction of the blind hole bottom, it will first approximately in the transition region between the main cutting edge 4 and the central flattened area 3 touch the material 15. If the movement in the feed direction 18 continues, the deep hole drill 1 more and more engages the workpiece. In contrast to the situation in FIG. 1, therefore, the drill does not set hard but softly in the borehole.
- a pilot drill 6 according to the invention is shown in a top view, i. on the face of the drill head shown. Clearly visible are the two main cutting edges 4. Furthermore, the spiral grooves 7 can be seen, which essentially serve the chip removal.
- the spiral grooves 7 are designed such that the core portion has a diameter 1 1, which is about 20% of the diameter 10 of the drill.
- Ausspitzache 8 provided.
- the core portion is reduced at its front end to a diameter 12 which is about 7% of the diameter 10 of the pilot drill.
- FIG. 4 shows a first side view of the front region of the pilot drill 6 according to the invention. Again, a channel 9 for a cooling or flushing fluid is shown.
- the main cutting edges 4 close to the rotation axis 13 of the pilot drill 6 at an angle of about 75 °, so that there is a point angle of about 150 °.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Drilling Tools (AREA)
- Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
- Superconductors And Manufacturing Methods Therefor (AREA)
- Turning (AREA)
- Processing Of Stones Or Stones Resemblance Materials (AREA)
- Drilling And Boring (AREA)
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102006018322A DE102006018322A1 (de) | 2006-04-19 | 2006-04-19 | Verfahren zum Einbringen eines Tieflochs und Pilotbohrer hierfür |
PCT/EP2007/050407 WO2007118718A1 (de) | 2006-04-19 | 2007-01-16 | Verfahren zum einbringen eines tieflochs und pilotbohrer hierfür |
Publications (2)
Publication Number | Publication Date |
---|---|
EP2007539A1 true EP2007539A1 (de) | 2008-12-31 |
EP2007539B1 EP2007539B1 (de) | 2010-04-21 |
Family
ID=37963555
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP07703917A Not-in-force EP2007539B1 (de) | 2006-04-19 | 2007-01-16 | Verfahren zum Einbringen eines Tiefloches |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP2007539B1 (de) |
AT (1) | ATE464964T1 (de) |
DE (2) | DE102006018322A1 (de) |
WO (1) | WO2007118718A1 (de) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8858134B2 (en) | 2008-01-15 | 2014-10-14 | EMUGE-Werk Richard Gimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge | Drilling tool having point thinning |
CN109604682A (zh) * | 2018-12-20 | 2019-04-12 | 哈尔滨电气动力装备有限公司 | 大型屏蔽电机温度传感器套管高精度锥面深孔加工工艺 |
Families Citing this family (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
ITTO20100839A1 (it) | 2010-10-15 | 2012-04-16 | Utensileria Navone S N C Di Navone Giovanni & C | Punta per utensile di foratura. |
CN103406557B (zh) * | 2013-08-29 | 2016-07-06 | 东风汽车公司 | 钢球密封锥面加工方法 |
US10532412B2 (en) | 2016-09-23 | 2020-01-14 | Milwaukee Electric Tool Corporation | Hole saw arbor assembly |
EP3354385B1 (de) | 2017-01-06 | 2020-05-27 | Milwaukee Electric Tool Corporation | Lochsäge |
USD973733S1 (en) | 2017-08-15 | 2022-12-27 | Milwaukee Electric Tool Corporation | Hole saw |
JPWO2019049258A1 (ja) * | 2017-09-07 | 2019-11-07 | オーエスジー株式会社 | 深穴加工方法 |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2700659A1 (de) * | 1977-01-08 | 1978-07-20 | Gildemeister Ag | Verfahren und werkzeugmaschine zur herstellung zueinander zentrischer abgesetzter bohrungen |
JPS5939245B2 (ja) * | 1979-11-26 | 1984-09-21 | 株式会社神戸製鋼所 | 高マンガン系非磁性鋼加工用ドリル |
JPH02232111A (ja) * | 1989-02-28 | 1990-09-14 | Toshiba Tungaloy Co Ltd | 長穴加工用の小径ドリル |
DE4117486C2 (de) * | 1991-05-28 | 1995-07-27 | Hitachi Seiko Kk | Bohrer |
DE19543233A1 (de) * | 1995-11-07 | 1997-05-15 | Johne & Co Praezisionswerkzeug | Bohrwerkzeug mit auswechselbarer Spitze |
SE525336C2 (sv) * | 2002-05-17 | 2005-02-01 | Sandvik Ab | Borrverktyg för hålborrning i metalliska material |
DE20304580U1 (de) * | 2003-03-21 | 2004-08-12 | Gühring, Jörg, Dr. | Bohrer |
DE10317567A1 (de) * | 2003-04-16 | 2004-10-28 | Gühring, Jörg, Dr. | Hochgeschwindigkeits-Zerspanungsverfahren |
-
2006
- 2006-04-19 DE DE102006018322A patent/DE102006018322A1/de not_active Withdrawn
-
2007
- 2007-01-16 EP EP07703917A patent/EP2007539B1/de not_active Not-in-force
- 2007-01-16 AT AT07703917T patent/ATE464964T1/de active
- 2007-01-16 DE DE502007003513T patent/DE502007003513D1/de active Active
- 2007-01-16 WO PCT/EP2007/050407 patent/WO2007118718A1/de active Application Filing
Non-Patent Citations (1)
Title |
---|
See references of WO2007118718A1 * |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8858134B2 (en) | 2008-01-15 | 2014-10-14 | EMUGE-Werk Richard Gimpel GmbH & Co. KG Fabrik für Präzisionswerkzeuge | Drilling tool having point thinning |
CN109604682A (zh) * | 2018-12-20 | 2019-04-12 | 哈尔滨电气动力装备有限公司 | 大型屏蔽电机温度传感器套管高精度锥面深孔加工工艺 |
CN109604682B (zh) * | 2018-12-20 | 2020-06-05 | 哈尔滨电气动力装备有限公司 | 大型屏蔽电机温度传感器套管高精度锥面深孔加工工艺 |
Also Published As
Publication number | Publication date |
---|---|
WO2007118718A1 (de) | 2007-10-25 |
EP2007539B1 (de) | 2010-04-21 |
ATE464964T1 (de) | 2010-05-15 |
DE502007003513D1 (de) | 2010-06-02 |
DE102006018322A1 (de) | 2007-10-25 |
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